GBA: Fix hang when loading a savestate if sync to video is enabled

CHANGES

@@ -33,6 +33,7 @@ Bugfixes:
  - GBA Memory: Fix 32-bit loads from unaddress cartridge space
  - Qt: Fix multiplayer windows opening as the wrong size
  - Qt: Fix controllers sometimes not loading the right profile
+ - GBA: Fix hang when loading a savestate if sync to video is enabled
 Misc:
  - Qt: Show multiplayer numbers in window title
  - Qt: Handle saving input settings better

src/gba/serialize.c

@@ -178,7 +178,7 @@ static bool _loadPNGState(struct GBA* gba, struct VFile* vf) {
 	PNGReadFooter(png, end);
 	PNGReadClose(png, info, end);
 	gba->video.renderer->putPixels(gba->video.renderer, VIDEO_HORIZONTAL_PIXELS, pixels);
-	GBASyncPostFrame(gba->sync);
+	GBASyncForceFrame(gba->sync);
 
 	free(pixels);
 	return true;

src/gba/supervisor/thread.c

@@ -712,6 +712,16 @@ void GBASyncPostFrame(struct GBASync* sync) {
 	MutexUnlock(&sync->videoFrameMutex);
 }
 
+void GBASyncForceFrame(struct GBASync* sync) {
+	if (!sync) {
+		return;
+	}
+
+	MutexLock(&sync->videoFrameMutex);
+	ConditionWake(&sync->videoFrameAvailableCond);
+	MutexUnlock(&sync->videoFrameMutex);
+}
+
 bool GBASyncWaitFrameStart(struct GBASync* sync, int frameskip) {
 	if (!sync) {
 		return true;

src/gba/supervisor/thread.h

@@ -138,6 +138,7 @@ void GBAThreadTakeScreenshot(struct GBAThread* threadContext);
 #endif
 
 void GBASyncPostFrame(struct GBASync* sync);
+void GBASyncForceFrame(struct GBASync* sync);
 bool GBASyncWaitFrameStart(struct GBASync* sync, int frameskip);
 void GBASyncWaitFrameEnd(struct GBASync* sync);
 bool GBASyncDrawingFrame(struct GBASync* sync);